# cython: language_level=3
import numpy as np
cimport numpy as np
cimport cython

AES128_SBOX=np.array([
    0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
    0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
    0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
    0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
    0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
    0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
    0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
    0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
    0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
    0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
    0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
    0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
    0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
    0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
    0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
    0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
],dtype=np.uint8)

AES128_INVSBOX = np.array([
    0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
    0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
    0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
    0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
    0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
    0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
    0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
    0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
    0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
    0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
    0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
    0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
    0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
    0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
    0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
    0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
],dtype=np.uint8)

@cython.boundscheck(False)
cdef np.ndarray[np.uint8_t, ndim=1] _aes_key_expansion(np.ndarray[np.uint8_t, ndim=1] mkey, int round):
    cdef unsigned char RC[11]
    cdef np.ndarray[np.uint8_t, ndim=1] tmp
    cdef np.ndarray[np.uint8_t, ndim=1] round_key
    RC=[0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36]
    tmp=np.zeros((4), dtype=np.uint8)
    round_key=np.zeros((16*(round+1)), dtype=np.uint8)
    round_key[:16]=mkey
    for i in range(4, 4*(round+1)):
        tmp[0] = round_key[4 * (i - 1) + 0]
        tmp[1] = round_key[4 * (i - 1) + 1]
        tmp[2] = round_key[4 * (i - 1) + 2]
        tmp[3] = round_key[4 * (i - 1) + 3]
        if i % 4 == 0:
            t = tmp.copy()
            tmp[0] = AES128_SBOX[t[1]] ^ RC[int(i / 4)]
            tmp[1] = AES128_SBOX[t[2]]
            tmp[2] = AES128_SBOX[t[3]]
            tmp[3] = AES128_SBOX[t[0]]
        round_key[4 * i + 0] = round_key[4 * (i - 4) + 0] ^ tmp[0]
        round_key[4 * i + 1] = round_key[4 * (i - 4) + 1] ^ tmp[1]
        round_key[4 * i + 2] = round_key[4 * (i - 4) + 2] ^ tmp[2]
        round_key[4 * i + 3] = round_key[4 * (i - 4) + 3] ^ tmp[3]
    return round_key[-16:]

def aes_key_expansion(mkey,round):
    return _aes_key_expansion(mkey,round)

cdef np.ndarray[np.uint8_t, ndim=1] _aes_round10_xor_real(np.ndarray[np.uint8_t, ndim=2] ciphertext,np.ndarray[np.uint8_t, ndim=2] rkey,int target_byte):
    cdef unsigned char SHIFT[16]
    cdef np.ndarray[np.uint8_t, ndim=1] round10_state
    cdef np.ndarray[np.uint8_t, ndim=1] round9_state
    SHIFT=[0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, 1, 6, 11]
    round10_state=ciphertext[:, SHIFT[target_byte]]
    round9_state=AES128_INVSBOX[ciphertext[:, target_byte] ^ rkey[:,target_byte]]
    return round10_state^round9_state

cdef np.ndarray[np.uint8_t, ndim=2] _aes_round10_xor_guess(np.ndarray[np.uint8_t, ndim=2] ciphertext,int target_byte):
    cdef unsigned char SHIFT[16]
    cdef np.ndarray[np.uint8_t, ndim=1] guess_key
    cdef np.ndarray[np.uint8_t, ndim=1] round10_state
    cdef np.ndarray[np.uint8_t, ndim=2] round9_state
    cdef np.ndarray[np.uint8_t, ndim=2] round10_xor
    SHIFT=[0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, 1, 6, 11]
    guess_key=np.array(range(256),dtype=np.uint8)
    round10_state=ciphertext[:, SHIFT[target_byte]]
    round9_state=AES128_INVSBOX[np.array([ct^guess_key for ct in ciphertext[:, target_byte]],dtype=np.uint8)]
    round10_xor=np.array([round10_state[i]^round9_state[i] for i in range(ciphertext.shape[0])],dtype=np.uint8)
    return round10_xor

def aes_round10_xor(ciphertext,target_byte,key=None):
    if key is None:
        return _aes_round10_xor_guess(ciphertext,target_byte)
    else:
        return _aes_round10_xor_real(ciphertext,key,target_byte)